Translations:Dual-sensor wavelet estimation/2/en

For the deep system, one input is the downgoing wave at the receiver, and one output is the upgoing wave at the receiver. The other input is the upgoing wave at the lowermost interface, and the other output is the downgoing wave at the lowermost interface. We assume that the basement rock is below the lowermost interface and that no reflected energy is produced from the basement. As a result, the upgoing wave at the lowermost interface is null, and hence, in effect, the other input to the deep system is null. Thus, the deep system is passive, with a single input (the downgoing wave at the receiver). If we consider the output given by the upgoing wave at the receiver, then we have a conventional convolutional model with one input and one output (Figure 17).